#include<fstream>
using namespace std;
int n, m, a[301][301], i, j, x, ii, jj, maxim, nr, k, l;
int main()
{
    ifstream f("teren.in");
    ofstream g("teren.out");
    f>>n>>m>>x;
    for(i=1;i<=n;i++)
        for(j=1;j<=m;j++) {
            f>>a[i][j];
            a[i][j] += (a[i-1][j] + a[i][j-1] - a[i-1][j-1]);
        }

    f.close();
    for(i=1;i<=n;i++)
        for(j=1;j<=m;j++)
            for(ii=i;ii<=n;ii++)
                for(jj=j;jj<=m;jj++)
                {
                    nr=a[ii][jj] - a[ii][j-1] - a[i-1][jj] + a[i-1][j-1];

                    if(nr<=x)
                        if(maxim<(ii-i+1)*(jj-j+1))
                            maxim=(ii-i+1)*(jj-j+1);
                }
    g<<maxim;
    g.close();
    return 0;
}